The purpose of this project is oxygen removal from nitrogen gas stream to use in various applications. It is important especially for gas chromatography, to remove oxygen to prevent any damage to chromatographic columns and increasing its lifetime. Negative corona discharge-ion mobility spectrometry (NCD-IMS) was employed for determination of oxygen in gas streams. The limit of detection and linear dynamic range with high correlation coefficient (r 2 = 0.9997), were obtained for oxygen gas as 8.5 and 28-14204 ppm, respectively. The relative standard deviations of method for intraday and interday were obtained 4 and 11 %, respectively. Suitable oxygen scavengers such as MnO and Cu powder were prepared and after testing, the optimum temperature of the reactor containing the compounds for MnO and Cu powder, were obtained as 180 and 230 °C , respectively. Lifetimes of these compounds were evaluated at their optimum temperature. Due to higher lifetime of copper powder, it was chosen as the suitable oxygen scavenger. To prevent agglomeration of copper powder and to increase its surface area and its performance at lower temperatures catalysts of copper on different supports such as bentonite, alumina and silicon dioxide prepared. After evaluating the efficiency of these catalysts, the silicon dioxide was chosen as the best support. Catalyst particle size was chosen so that the problem of back pressure in high flow rate of gas does not exist. In order to optimize the concentration of copper, lifetime of catalysts to contain 20, 30, 40, 50, 60 and 90 % of copper supported on silicon dioxide were evaluated. After testing the catalysts, it was found that the catalyst containing 50% copper has the highest performance. The effectiveness of optimized catalyst was investigated at different temperatures of 50, 100 and 150 . The results showed that with temperature increase, the lifetime of the catalyst was also increased. The BTS commercial catalyst was also used to evaluate its performance in the removal of oxygen. The lifetime of BTS catalyst was also investigated at three different temperatures of 50, 100 and 150°C. Various methods such as, ICP, XRF, FT-IR, and CHNS were used to determine its nature. According to the results of ICP and XRF, the highest metal content of commercial catalyst was Cu, silica and magnesium. To determine the commercial catalyst surface area and optimized catalyst, BET method was used for both catalysts. The surface area obtained for Cu catalyst and commercial catalyst respectively, 114 and 117 square meter per gram.
